1 /* Legacy IPv4 text-to-address functions.
2 Copyright (C) 2019-2023 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19 /*
20 * Copyright (c) 1983, 1990, 1993
21 * The Regents of the University of California. All rights reserved.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the above copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 4. Neither the name of the University nor the names of its contributors
32 * may be used to endorse or promote products derived from this software
33 * without specific prior written permission.
34 *
35 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
36 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
37 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
38 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
39 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
40 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
41 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
42 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
43 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
44 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
45 * SUCH DAMAGE.
46 */
47
48 /*
49 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
50 *
51 * Permission to use, copy, modify, and distribute this software for any
52 * purpose with or without fee is hereby granted, provided that the above
53 * copyright notice and this permission notice appear in all copies, and that
54 * the name of Digital Equipment Corporation not be used in advertising or
55 * publicity pertaining to distribution of the document or software without
56 * specific, written prior permission.
57 *
58 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
59 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
60 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
61 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
62 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
63 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
64 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
65 * SOFTWARE.
66 */
67
68 /*
69 * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
70 *
71 * Permission to use, copy, modify, and distribute this software for any
72 * purpose with or without fee is hereby granted, provided that the above
73 * copyright notice and this permission notice appear in all copies.
74 *
75 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
76 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
77 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
78 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
79 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
80 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
81 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
82 * SOFTWARE.
83 */
84
85 #include <sys/types.h>
86 #include <sys/param.h>
87
88 #include <netinet/in.h>
89 #include <arpa/inet.h>
90
91 #include <ctype.h>
92
93 #include <endian.h>
94 #include <stdint.h>
95 #include <stdlib.h>
96 #include <limits.h>
97 #include <errno.h>
98
99 /* Check whether "cp" is a valid ASCII representation of an IPv4
100 Internet address and convert it to a binary address. Returns 1 if
101 the address is valid, 0 if not. This replaces inet_addr, the
102 return value from which cannot distinguish between failure and a
103 local broadcast address. Write a pointer to the first
104 non-converted character to *endp. */
105 static int
106 inet_aton_end (const char *cp, struct in_addr *addr, const char **endp)
107 {
108 static const in_addr_t max[4] = { 0xffffffff, 0xffffff, 0xffff, 0xff };
109 in_addr_t val;
110 char c;
111 union iaddr
112 {
113 uint8_t bytes[4];
114 uint32_t word;
115 } res;
116 uint8_t *pp = res.bytes;
117 int digit;
118
119 int saved_errno = errno;
120 __set_errno (0);
121
122 res.word = 0;
123
124 c = *cp;
125 for (;;)
126 {
127 /* Collect number up to ``.''. Values are specified as for C:
128 0x=hex, 0=octal, isdigit=decimal. */
129 if (!isdigit (c))
130 goto ret_0;
131 {
132 char *endp;
133 unsigned long ul = __strtoul_internal (cp, &endp, 0, 0);
134 if (ul == ULONG_MAX && errno == ERANGE)
135 goto ret_0;
136 if (ul > 0xfffffffful)
137 goto ret_0;
138 val = ul;
139 digit = cp != endp;
140 cp = endp;
141 }
142 c = *cp;
143 if (c == '.')
144 {
145 /* Internet format:
146 a.b.c.d
147 a.b.c (with c treated as 16 bits)
148 a.b (with b treated as 24 bits). */
149 if (pp > res.bytes + 2 || val > 0xff)
150 goto ret_0;
151 *pp++ = val;
152 c = *++cp;
153 }
154 else
155 break;
156 }
157 /* Check for trailing characters. */
158 if (c != '\0' && (!isascii (c) || !isspace (c)))
159 goto ret_0;
160 /* Did we get a valid digit? */
161 if (!digit)
162 goto ret_0;
163
164 /* Check whether the last part is in its limits depending on the
165 number of parts in total. */
166 if (val > max[pp - res.bytes])
167 goto ret_0;
168
169 if (addr != NULL)
170 addr->s_addr = res.word | htonl (val);
171 *endp = cp;
172
173 __set_errno (saved_errno);
174 return 1;
175
176 ret_0:
177 __set_errno (saved_errno);
178 return 0;
179 }
180
181 int
182 __inet_aton_exact (const char *cp, struct in_addr *addr)
183 {
184 struct in_addr val;
185 const char *endp;
186 /* Check that inet_aton_end parsed the entire string. */
187 if (inet_aton_end (cp, &val, &endp) != 0 && *endp == 0)
188 {
189 *addr = val;
190 return 1;
191 }
192 else
193 return 0;
194 }
195 libc_hidden_def (__inet_aton_exact)
196
197 /* inet_aton ignores trailing garbage. */
198 int
199 __inet_aton_ignore_trailing (const char *cp, struct in_addr *addr)
200 {
201 const char *endp;
202 return inet_aton_end (cp, addr, &endp);
203 }
204 weak_alias (__inet_aton_ignore_trailing, inet_aton)
205
206 /* ASCII IPv4 Internet address interpretation routine. The value
207 returned is in network order. */
208 in_addr_t
209 __inet_addr (const char *cp)
210 {
211 struct in_addr val;
212 const char *endp;
213 if (inet_aton_end (cp, &val, &endp))
214 return val.s_addr;
215 return INADDR_NONE;
216 }
217 weak_alias (__inet_addr, inet_addr)